Fuel-injection valve for internal-combustion engines



Feb. 21, 1933. I H; VONRUTI 1,898,751

FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINESv Filed March 2, 1931 2 Sheets-Sheet l Feb. 21, 1933. V U 1,898,751

FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES Filed March 2, 1931 2 Sheets-Sheet 2 7 Patented Feb. 21, 1933 UNITED STATES PATENT OFFICE HANS VONR'U'TI, 0F WINTERTHUR, SWITZERLAND, ASSIGNOR TO SWISS LOCOMOTIVE- AND MACHINE WORKS, OF WINTERTHUR, SWITZERLAND, A CORPORATION OF SWITZERLAND FUEL-INJECTION VALVE FOR INTERNAL-COMBUSTION ENGINES Application filed March 2,1931, Serial No. 519,529, and in Switzerland March 4, 1930.

I have filed application in Switzerland 011 March 4, 1930. e

The present invention relates to fuel-injection valves for internal-combustion engines, and has for one. of its objects to provide an improved construction wherein the small ducts for conveying the fuel to the valve seat are shorter and consequently can be. made more conveniently and better than heretofore.

According to the invention there is provided a fuel injection valve whereof the valve-body, in which the valve member and its closure spring is arranged, is made in two parts, and wherein the fuel conduit leading the fuel to the valve seat makes a fluid-tight joint with the body having the valve seat. The lower part is pressed by the upper part against the cylinder cover or a bush therein which shuts 05 the water-cooled chamber from the valve body.

Preferably the valve member is mounted eccentrically in the fuel-valve body.

According to another feature of the invention, the lower part is connected in such manner with the upper part (without prejudicially affecting the joint with the fuelsupply conduit) that when removing the upper part the lower part will come with it; the same is true when inserting the twopart' body of the fuel-valve.

An important advantage of the improved construction is that, as compared with onepiece bodies of fuel-valves, the small ducts for leading the fuel to the valve seat are much shorter and therefore can be'made better. As the two parts are screwed together, however, the valve body together with the entire valve member and the nozzle screwed thereto can be removed for inspection, cleaning and the like just as if the valve body consisted of one piece.

Two embodiments of the invention are illustrated by way of example in the accompanying drawings, wherein:

Figure l'is a vertical section form of fuel-injection valve according to the invention in its assembled condition ready for use,

showing one Figure 2 is a like view of the same valve in its semidismembered condition and taken in a place at right-angles to that of Figure 1, and

Figure 3 is a top plan tion shown in Figure 2;

Figure 4 is a-vertical section showing a, second form vention,

Figure 5 is a plan view taken in the direction of the arrow I in Figure 4, and

Figure 6 is a cross-section taken on the line 11-11 in Figure 4.

Like reference characters designate like parts throughout the several views.

Referring first to Figure 1, a fuel-injection valve 2 is inserted into a cylinder cover or head 1 of an internal-combustion engine comprising a cylinder 5 having a liner 4 containing a working piston 3. The fuel-valve body, wherein the valvemember 2 pressed-by a spring 6 is mounted, consists of a lower part 7 and an upper part 8 separated at 9 in a plane lying transversely of the longitudinal axis of the cylinder.

The lower part 7 has a seat 10 for the valve inepober 2 and a cylindrical guide 11 for the at er.

view of the construcof" valve according to the in- The upper part 8 contains the valve spring a 6 with its end plates or washers 12 and 13, and a screw 14 for pressing the spring 6 downwards; this screw 14 is screwed into a stop or abutment 15 which is held down by studs 16 on a distance ring 17 and on the flanged end 31 of the part 8. These screwthreaded studs 16 also serve for detachably connecting together the upper and lower parts 8 and 7 of the fuel-valve body. A valve-abutment 19 constituted by the lower end of the stop 15 is so adjustedby making the ring 17 a predetermined axial length that the valve member 2 has a predetermined lift determined by the distance 18 between lower valve plate 12 and the lower edge 19 of the stop 15. The lift can be adjusted by varying the axial length of the ring 17.

A feed tube 21 for fuel makes joint at 20 with the lower part 7 of the injection valve body. This tube 21 extends through a bore hole 22 in the upper part 8 and is pressed by a flange 23 and bolts 24 and 25 on its seat 20 in the part 7. The fuel flows from the joint seat20 through a duct 26 to a space in front of the valve seat 10 and thence, when the valve 2 is open, through a nozzle 27 into the combustion chamber in the cylinder.

In the construction shown in Figure 1 there is arranged surrounding the fuel-valve body 7, 8 a bushing 28 which separates a water chamber 29 in the cylinder head 1 from the valve-body 7, 8. This bushing 28 and the upper part 8 of the valve-body are pressed downwards by flanges 30 and 31, respectively, by means of the bolts 24, 25.

Figure 2 shows the valve-body 7, 8 according to Figure 1 in a semi-removed position. It shows clearly that the studs 16 hold the lower part 7 and the upper part 8 together, so that when the latter is being removed from the bushing 28 the lower part 7 will come with it.

Figure 3 clearly shows the two heads of the screws or studs 16 which effect the connection of the two parts 7, 8 of the valvebody. It also shows the position of the screw 14, and the bore-hole 22 in which the fuel-supply tube 21 extends downwards.

Figure 4 shows an embodiment of the invention for a smaller valve-member. This construction is in general similar to that described above with reference to Figures 1 to 3, but the valve member and its spindle 2 are located eccentrically in the valve-body 7 S to make more room for the feed tube 21 that leads down to the lower part 8 of the valvebody. The outer periphery of the upper and lower parts 7, 8 is thus eccentric to the longitudinal axis of the valve spindle 2, as clearly indicated in Figures 4 to 6. The screws 16 in this construction lie in a plane that does not contain the valve-member 2.

Figure 5 shows the nuts 32 and 33 for screwing down the fuel-supply pipe,'and the squared end 34 of the screw 14 for loading the spring 6. The screws 16lie in a plane that is situated in the middle of the parts 7 and 8 and lies at right angles to the plane containing the bolts 24 and 25.

The fuel-supply tube 21 is shown in both the Figures 5 and 6. The-relative positions of the valve member and its spindle2, the two screws 16 for simultaneously removing the upper and lower parts 8 and 7, and the tube 21 are also clearly shown in Figures 5 and 6. The tube 21 can be pressed on its seat by the flange 31 which presses the lower part 7 of the valve body or, alternatively, as shown 1n Figures 1 and 4 a separate flange 23 may be provided for this purpose. In this construction, by simply loosening the flange 23 the tube 21 can be removed when its lower end is cylindrical and it has no shoulder as shown in Figures 1 and 4.

I claim 1. A fuel-injection valve for internal comlower part has an accentrically arranged valve seat, a valve member on the latter, a

spring tending to seat the valve member, and

a fuel-supply tube that extends through the upper part, leads towards the valve seat and is jointed fluid-tight with said lower part.

3. A fuel-injection valve for internal-combustion engines, comprising in combination a hollow valve body divided. into a lower part and an upper part seated thereon, which lower part has a valve seat, a valve member on the latter, a spring tending to seat the valve member, a duct in the lower part leading to the valve seat, a fuel-supply tube that extends through the upper part, opens into said duct and is jointed fluid-tight with said lower part, and means securing said .upper part to said lower part.

. 4. A fuel-injection valve for internal combustion engines, comprising in combination a hollow valve body divided into a lower part and an upper part seated thereon, which lower part has a valve seatand a duct leading downwards thereto, a spring-loaded valve member on said valve seat, a fuelsupply tube that extends through said upper part, opens into said duct and is jointed fluidtight to said lower part, means for pressing said tube on its seat in said lower part, and means for pressing the upper part on to said lower part and thereby pressing the latter on a support.

5. A fuel-injection valve for internal-combustion engines, comprising in combination a hollow valve body divided into a lower part and an upper part seated thereon, screws securing said parts together, which lower part has a valve seat and a duct leading downwards thereto, a spring-loaded valve member on said seat,'a fuel-supply tube that extends through said upper part, opens into said duct and is jointed fluid-tight to said lower part, and bolts for pressing the upper part on to said lower part and thereby pressing the latter on its supports, which bolts and screws lie in planes at right angles to one another.

6. A fuel injection valve for internal combustion engines comprising in combination an outer bushing, a cylinder head, means to secure said bushing to said cylinder head, a

into an outer and an inner part, a fuel feed tpipe, said outer part having a bore therein or said feed pipe, 9. seat for said feed pipe in said inner part, said inner part having a first bore, a fuel valve in said first bore, a seat for said fuel valve in said inner part,- means to press said feed pipe toits seat, said inner part having a second bore in axial alinement with the fuel valve, and a spring for closing said fuel valve.

7. A fuel injection valve for internal combustion engines comprising in combination an outer bushing, a cylinder head, means to secure said bushing to said cylinder head, a valve body, said valve body being divided into an outer and an inner part, a fuel feed pipe, said outer part having a bore parallel to the axis of the fuel valve for said feed pipe, a seat for said feed pipe in said inner part, said inner part having a first bore, a fuel valve in said first bore, a seat for said fuel valve in said inner part, means to press said feed pipe to its seat, said inner part having a second bore in axial alinement with the fuel valve, and a spring for closing sald fuel valve.

8. A fuel injection valve for internal com bustion engines comprising in combination an outer bushing, a cylinder head, means to secure said bushing to said cylinder head, a valve body, said valve body being divided into an outer and an inner part, a fuel feed pipe, said outer part having a bore for said feed pipe, a seat for said feed pipe in said inner part, said inner part having an eccentric first bore, a fuel valve therein, a seat for said fuel valve in said inner part, means to press said feed pipe to its seat, said inner part having a second bore in axial alinement WiZ-ll the fuel valve, and a spring for closing said fuel valve.

9. A fuel injection valve for internal combustion engines comprising in combination an outer bushin a cylinder head, means ts secure said bushing to said cylinder head, a valve body, said valve body being divided into an outer and an inner part, means to press said outer part en tenner part, a fuel feed pipe, said outer part having a bore for said feed pipe, a seat for said feed pipe in said inner part, said inner part having a first bore, a fuel valve in said first bore, a seat for said fuel valve in said inner part, means to press said feed pipe to its seat, said inner part having a second bore in axial alinepnent with the fuel valve, and a spring for closing said fuel valve.

10. A fuel injection valve for internal combustion engines comprising in combination an outer bushing, a cylinder head, means to secure said bushing to said cylinder head, a valve body, said valve body being divided into an outer and an inner part, means to press said outer part on to said inner part, ,means to secure said inner part to said outer .part, a fuel feed pipe, said outer art having a bore for said feed pipe, a seat for said feed pipe in said inner part, said inner part having a first bore, a fuel valve in said first bore, a seat for said fuel valve in said inner part, said inner part having a duct between said seat for the feed pipe and said fuel valve seat, means to press said feed pipe to its seat, said inner part having a second bore in axial alinement with the fuel valve, and, a spring for closing said fuel valve.

11. A fuel injection valve for internal cornbustion engines comp-rising in combination an outer bushing, a cylinder head, means to secure said bushing to said cylinder head, a valve body, said valve body being'divided into an outer and an inner part, means to press said outer part on to said inner part, means to secure said inner part to said outer part, a fuelfeed pipe, said outer part having a bore for said feed pipe, a seat for said feed pipe in said inner part, said inner part having a first bore, a fuel valve in said first bore, a seat for said fuel valve in said inner part, said inner part having a duct between said seat for said feed pipe and said valve seat, means to press said feed pipe to its seat, said inner part having a second bore in axial alinement with the fuel valve, and a spring for closing said fuel valve, said means to press said outer part of the valve body onto said inner part and said means to press said feed pipe to its seat including studs provided with collars and provided with screw threads and nuts on the studs.

12. A fuel injection valve for internal combustion engines comprising in combination an outer bushing, a cylinder head, means to secure said bushing to said cylinder head, a valve body, said valve body being divided into an outer and an inner part, means to press said outer part on to said inner part, means to secure said inner part to said outer part, a fuel feed pipe, said outer part having a bore for said feed pipe, a seat for said feed pipe in said inner part, said inner part having a first bore, a fuel valve in said first bore, a seat for said fuel valve in said inner part, said inner part having a not between 7 said seat for the feed pipe and said fuel valve seat, the means for pressing the-outer part on to the inner part also forming means for pressing said feed pipe to-its seat, said inner part having a second bore in axial alinement with thefuel valve, a spring for closing said fuel valve, said means to press said outer part of the valve body on to said inner part and to press said feed pipe to its seat including threaded studs provided with collars and nuts of different diameters, and bolts for securing said spring to its position, said studs and bolts lying in planes at right angles to one another.

In testimony whereof I afii'x my signature.

HANS VONRllTI. 

